What is the first weapon you acquire in Half-Life?

In the video game Half-Life, the first weapon that the player acquires is a crowbar. The crowbar becomes the protagonist Gordon Freeman's primary melee weapon early in the game. As players navigate the Black Mesa Research Facility, they initially find and use the crowbar to defend themselves against hostile creatures and obstacles. The crowbar, iconic to the Half-Life series, becomes a symbol of survival and resourcefulness for players as they progress through the game's storyline.