/display
Shows a piece of equipped gear in chat, optionally to a single player. Every form also exists as /mxt display …, and it is player-only.
/displayShows your main hand item and broadcasts it to everyone.
/display <player|slot>A slot name shows that slot of yours and broadcasts it; a player name sends your main hand to that player privately.
/display <player> <slot>Sends that player the named slot privately.
The slot names are mainhand, offhand, head, chest, legs and feet; an empty slot, an unknown player name or an unknown slot name is reported instead. The item is shown with the vanilla item hover.