black medium-small square (U+25FE)

The emoji you provided is a white square button with a black upwards-pointing triangle in the center, also known as "Up Button" or "Upwards Arrow." This emoji is often used to indicate that something should be moved up, scrolled up, or directed upwards. It can be used in a variety of contexts, such as in a chat conversation to ask someone to move their message up, or in a digital interface to indicate that a user can navigate upwards. It can also be used to represent an increase or improvement, such as in a graph or chart. Additionally, this emoji is often used in a playful or humorous way to indicate that something is "cool" or "on point."