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UI stands for user interface and it’s how a person interacts and controls an application or a device. For example: on a website, it’s the pages, buttons and icons; on a mobile, it includes the touchscreen and lights.
Ultra High Net Worth Individual (UHNW)

Similar to an HNW (High Net Worth Individual), but ultra High Net Worth individual will generally have a net worth in the tens of millions.

A unicorn is a privately held start-up company which is valued at over $1 billion.
User stories
A user story is an informal, general explanation of a software feature written from the perspective of the end user or customer.
User experience is a person's emotions and attitudes about using a particular product, system or service. It includes the practical, experiential, affective, meaningful, and valuable aspects of human–computer interaction and product ownership.