left-border

#left

#border

#boundary

#edge

#frame

#rim

#fringe

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
  <path d="M3.75 21C4.16421 21 4.5 20.6642 4.5 20.25V3.75C4.5 3.33579 4.16421 3 3.75 3C3.33579 3 3 3.33579 3 3.75V20.25C3 20.6642 3.33579 21 3.75 21Z" fill="black"/>
  <path d="M20.75 11.75C20.75 11.3358 20.4142 11 20 11C19.5858 11 19.25 11.3358 19.25 11.75C19.25 12.1642 19.5858 12.5 20 12.5C20.4142 12.5 20.75 12.1642 20.75 11.75Z" fill="black"/>
  <path d="M11.75 11C12.1642 11 12.5 11.3358 12.5 11.75C12.5 12.1642 12.1642 12.5 11.75 12.5C11.3358 12.5 11 12.1642 11 11.75C11 11.3358 11.3358 11 11.75 11Z" fill="black"/>
  <path d="M20.75 15.75C20.75 15.3358 20.4142 15 20 15C19.5858 15 19.25 15.3358 19.25 15.75C19.25 16.1642 19.5858 16.5 20 16.5C20.4142 16.5 20.75 16.1642 20.75 15.75Z" fill="black"/>
  <path d="M20 19C20.4142 19 20.75 19.3358 20.75 19.75C20.75 20.1642 20.4142 20.5 20 20.5C19.5858 20.5 19.25 20.1642 19.25 19.75C19.25 19.3358 19.5858 19 20 19Z" fill="black"/>
  <path d="M12.5 19.75C12.5 19.3358 12.1642 19 11.75 19C11.3358 19 11 19.3358 11 19.75C11 20.1642 11.3358 20.5 11.75 20.5C12.1642 20.5 12.5 20.1642 12.5 19.75Z" fill="black"/>
  <path d="M20 7C20.4142 7 20.75 7.33579 20.75 7.75C20.75 8.16421 20.4142 8.5 20 8.5C19.5858 8.5 19.25 8.16421 19.25 7.75C19.25 7.33579 19.5858 7 20 7Z" fill="black"/>
  <path d="M12.5 15.75C12.5 15.3358 12.1642 15 11.75 15C11.3358 15 11 15.3358 11 15.75C11 16.1642 11.3358 16.5 11.75 16.5C12.1642 16.5 12.5 16.1642 12.5 15.75Z" fill="black"/>
  <path d="M7.75 11C8.16421 11 8.5 11.3358 8.5 11.75C8.5 12.1642 8.16421 12.5 7.75 12.5C7.33579 12.5 7 12.1642 7 11.75C7 11.3358 7.33579 11 7.75 11Z" fill="black"/>
  <path d="M12.5 7.75C12.5 7.33579 12.1642 7 11.75 7C11.3358 7 11 7.33579 11 7.75C11 8.16421 11.3358 8.5 11.75 8.5C12.1642 8.5 12.5 8.16421 12.5 7.75Z" fill="black"/>
  <path d="M20 3C20.4142 3 20.75 3.33579 20.75 3.75C20.75 4.16421 20.4142 4.5 20 4.5C19.5858 4.5 19.25 4.16421 19.25 3.75C19.25 3.33579 19.5858 3 20 3Z" fill="black"/>
  <path d="M16.5 11.75C16.5 11.3358 16.1642 11 15.75 11C15.3358 11 15 11.3358 15 11.75C15 12.1642 15.3358 12.5 15.75 12.5C16.1642 12.5 16.5 12.1642 16.5 11.75Z" fill="black"/>
  <path d="M7.75 3C8.16421 3 8.5 3.33579 8.5 3.75C8.5 4.16421 8.16421 4.5 7.75 4.5C7.33579 4.5 7 4.16421 7 3.75C7 3.33579 7.33579 3 7.75 3Z" fill="black"/>
  <path d="M8.5 19.75C8.5 19.3358 8.16421 19 7.75 19C7.33579 19 7 19.3358 7 19.75C7 20.1642 7.33579 20.5 7.75 20.5C8.16421 20.5 8.5 20.1642 8.5 19.75Z" fill="black"/>
  <path d="M15.75 3C16.1642 3 16.5 3.33579 16.5 3.75C16.5 4.16421 16.1642 4.5 15.75 4.5C15.3358 4.5 15 4.16421 15 3.75C15 3.33579 15.3358 3 15.75 3Z" fill="black"/>
  <path d="M12.5 3.75C12.5 3.33579 12.1642 3 11.75 3C11.3358 3 11 3.33579 11 3.75C11 4.16421 11.3358 4.5 11.75 4.5C12.1642 4.5 12.5 4.16421 12.5 3.75Z" fill="black"/>
  <path d="M15.75 19C16.1642 19 16.5 19.3358 16.5 19.75C16.5 20.1642 16.1642 20.5 15.75 20.5C15.3358 20.5 15 20.1642 15 19.75C15 19.3358 15.3358 19 15.75 19Z" fill="black"/>
</svg>

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
  <path d="M3.75 21C4.16421 21 4.5 20.6642 4.5 20.25V3.75C4.5 3.33579 4.16421 3 3.75 3C3.33579 3 3 3.33579 3 3.75V20.25C3 20.6642 3.33579 21 3.75 21Z" fill="black"/>
  <path d="M20.75 11.75C20.75 11.3358 20.4142 11 20 11C19.5858 11 19.25 11.3358 19.25 11.75C19.25 12.1642 19.5858 12.5 20 12.5C20.4142 12.5 20.75 12.1642 20.75 11.75Z" fill="black"/>
  <path d="M11.75 11C12.1642 11 12.5 11.3358 12.5 11.75C12.5 12.1642 12.1642 12.5 11.75 12.5C11.3358 12.5 11 12.1642 11 11.75C11 11.3358 11.3358 11 11.75 11Z" fill="black"/>
  <path d="M20.75 15.75C20.75 15.3358 20.4142 15 20 15C19.5858 15 19.25 15.3358 19.25 15.75C19.25 16.1642 19.5858 16.5 20 16.5C20.4142 16.5 20.75 16.1642 20.75 15.75Z" fill="black"/>
  <path d="M20 19C20.4142 19 20.75 19.3358 20.75 19.75C20.75 20.1642 20.4142 20.5 20 20.5C19.5858 20.5 19.25 20.1642 19.25 19.75C19.25 19.3358 19.5858 19 20 19Z" fill="black"/>
  <path d="M12.5 19.75C12.5 19.3358 12.1642 19 11.75 19C11.3358 19 11 19.3358 11 19.75C11 20.1642 11.3358 20.5 11.75 20.5C12.1642 20.5 12.5 20.1642 12.5 19.75Z" fill="black"/>
  <path d="M20 7C20.4142 7 20.75 7.33579 20.75 7.75C20.75 8.16421 20.4142 8.5 20 8.5C19.5858 8.5 19.25 8.16421 19.25 7.75C19.25 7.33579 19.5858 7 20 7Z" fill="black"/>
  <path d="M12.5 15.75C12.5 15.3358 12.1642 15 11.75 15C11.3358 15 11 15.3358 11 15.75C11 16.1642 11.3358 16.5 11.75 16.5C12.1642 16.5 12.5 16.1642 12.5 15.75Z" fill="black"/>
  <path d="M7.75 11C8.16421 11 8.5 11.3358 8.5 11.75C8.5 12.1642 8.16421 12.5 7.75 12.5C7.33579 12.5 7 12.1642 7 11.75C7 11.3358 7.33579 11 7.75 11Z" fill="black"/>
  <path d="M12.5 7.75C12.5 7.33579 12.1642 7 11.75 7C11.3358 7 11 7.33579 11 7.75C11 8.16421 11.3358 8.5 11.75 8.5C12.1642 8.5 12.5 8.16421 12.5 7.75Z" fill="black"/>
  <path d="M20 3C20.4142 3 20.75 3.33579 20.75 3.75C20.75 4.16421 20.4142 4.5 20 4.5C19.5858 4.5 19.25 4.16421 19.25 3.75C19.25 3.33579 19.5858 3 20 3Z" fill="black"/>
  <path d="M16.5 11.75C16.5 11.3358 16.1642 11 15.75 11C15.3358 11 15 11.3358 15 11.75C15 12.1642 15.3358 12.5 15.75 12.5C16.1642 12.5 16.5 12.1642 16.5 11.75Z" fill="black"/>
  <path d="M7.75 3C8.16421 3 8.5 3.33579 8.5 3.75C8.5 4.16421 8.16421 4.5 7.75 4.5C7.33579 4.5 7 4.16421 7 3.75C7 3.33579 7.33579 3 7.75 3Z" fill="black"/>
  <path d="M8.5 19.75C8.5 19.3358 8.16421 19 7.75 19C7.33579 19 7 19.3358 7 19.75C7 20.1642 7.33579 20.5 7.75 20.5C8.16421 20.5 8.5 20.1642 8.5 19.75Z" fill="black"/>
  <path d="M15.75 3C16.1642 3 16.5 3.33579 16.5 3.75C16.5 4.16421 16.1642 4.5 15.75 4.5C15.3358 4.5 15 4.16421 15 3.75C15 3.33579 15.3358 3 15.75 3Z" fill="black"/>
  <path d="M12.5 3.75C12.5 3.33579 12.1642 3 11.75 3C11.3358 3 11 3.33579 11 3.75C11 4.16421 11.3358 4.5 11.75 4.5C12.1642 4.5 12.5 4.16421 12.5 3.75Z" fill="black"/>
  <path d="M15.75 19C16.1642 19 16.5 19.3358 16.5 19.75C16.5 20.1642 16.1642 20.5 15.75 20.5C15.3358 20.5 15 20.1642 15 19.75C15 19.3358 15.3358 19 15.75 19Z" fill="black"/>
</svg>