Sweaty smile. Relief that a tight situation went well or was coped with positively, e.g. an important appointment. A difficult event is imminent and you are already nervous.
The grinning face with sweat emoji was introduced in 2010 and released as part of the Unicode 11.0 standard. This emoji can be found under the smileys and emotions
category. Because the grinning face with sweat emoji has been around for quite some time, it should display correctly in the majority of operating systems.