Gui vessel character

It names the vessel usually written 簋 (guǐ).

In Mandarin, 簋 is pronounced guǐ; the rare graph 𭾁 appears as an alternate written form of that character.

What was a gui vessel used for?

It held grain for meals and ritual offerings.

Bronze gui appear by the mid-Shang period, though few survive. In the Western Zhou, they became important ritual vessels, paired in even numbers with odd-numbered bronze 鼎 (ding) cauldrons at ceremonies and banquets. Their ritual importance faded in the mid-to-late Spring and Autumn period; by the Warring States period, bronze gui had largely left ritual sets.

What does 簠𭾁 mean?

Two separate vessel names.

In historical Chinese inventories, 簠𭾁 lists two separate vessels, not one compound word.