IOI, an acronym for "Indicator of Interest", refers to a non-verbal or subtle expression of attraction or attention from one person towards another. While this term is prominently used within the dating and relationship context, several synonyms can be used to convey similar intentions. Expressions such as "flirting", "subtle flirtation" or "signs of affection" convey the idea of showing interest in a more direct manner. Other synonyms may include "courting", "wooing", or even "preliminary moves". Whether it's a lingering gaze, a friendly smile, or engaging conversations, these terms encapsulate the various ways individuals display their interest in one another. While IOI remains a widely-used term, many synonyms can effectively describe the same concept of expressing interest or attraction.