This is a Leatherman PST, which stands for Personal Survival Tool. Ordinarily if write about how iconic and important this tool is, and it absolutely is- but you can read all that here: https://wiki.multitool.org/tiki-index.php?page=PST
If ever there was the One Tool to Rule Them All, it’s Leatherman’s Pocket (or Personal) Survival Tool, affectionately known as the PST. This was the original Leatherman production model, and the source of inspiration for all current issue multitools, and the One Tool (see?) that was single handedly responsible for resurrecting a virtually extinct niche market and bringing it to the masses.