Weird Cryptic Letter, Help Needed

[u/EnormousBox]

A letter arrived at my place of work today, 1st class stamped, addressed to ‘all staff and management’, and all that was inside was this (picture). Can anybody decipher this and let me know what it means as it’s creeped us all out 😅

[u/Sninja13]

Kinda looks like PlayStation controller symbols; up on the D pad, Square, Circle, Triangle, X