Minecraft wiki entry for Stairs, associated text: Between Java Edition 1.17 snapshots 20w45a and 21w05a, "Waxed Lightly Weathered Cut Copper Stairs" was the longest name for any block in Minecraft, at 41 characters with spaces, or 36 without.
The April Fools snapshot 20w14∞ included a block called "Swaggiest stairs ever", which was a stair variant for the netherite block.