thumbtack v. push pin

Thumbtacks A thumbtack is a tack with a large flat metal head used to fasten documents to a wall or board. As their name implies, thumbtacks can be pressed into place by hand. Push pins serve the same purpose, but because they have longer, spool-shaped plastic handles, they are easier to insert and remove. This shape also makes them somewhat safer, since they tend not to settle on horizontal surfaces with their pins facing up, as thumbtacks do.

Push pins