The kanji 診 primarily conveys the meaning of "to examine," "to diagnose," or "to inspect," particularly in a medical context. It relates to the act of a doctor or medical professional examining a patient to determine their condition. It implies a careful and detailed observation to reach a conclusion about someone's health.

・On-yomi (音読み): シン ・Kun-yomi (訓読み): み（る） - 診る to examine, to diagnose

⚫︎ 診察 Translation: medical examination, consultation ⚫︎ 診断 Translation: diagnosis ⚫︎ 内科の先生に診てもらう Translation: to have a doctor examine someone (lit. to have a doctor of internal medicine examine someone)

The kanji 診 is a phono-semantic compound (形声文字). It is composed of two parts: the radical 言 (ことば - meaning "words" or "speech") on the left and the phonetic component 㐱 (shin) on the right. 言 indicates that the action involves using words, specifically by asking questions and talking about the person's illness or health. 㐱 functions as a phonetic component, lending the character its pronunciation. Therefore, the kanji 診 visually represents the act of a medical professional 言 speaking and listening carefully 㐱 to a patient to arrive at a diagnosis.