A singlet can refer to different things depending on the context. Here are some possible meanings:

• Clothing: In some countries, a singlet is a sleeveless undershirt worn by men, similar to a tank top or a vest. In other countries, a singlet can refer to a sleeveless sports shirt worn by athletes, especially runners and joggers.
• Physics: In physics, a singlet can refer to an atom or molecule that has no net electronic magnetic moment, or to an excited state of an atom or molecule that is a singlet.
• Plurals: In some online communities, a singlet is a person who identifies as a single individual, as opposed to a plural system where multiple individuals share one body.

The meaning of "singlet" depends on the context in which it is used.