What is haven t heard from him?

"Haven't heard from him" typically indicates that the speaker has not received any communication or contact from a particular person, usually over a period of time. This could be due to several reasons, such as the person being busy or unavailable, not wanting to communicate, or being out of reach. It can also indicate a potential issue or concern, such as a missed appointment or lack of response to an important message. The specific context of the situation will often determine the level of urgency or significance attached to the phrase.