Mamsir

Mamsir is a Filipino title "used to address ladies, gentlemen, and variations thereof". It's a gender neutral alternative to "ma'am" and "sir".

It's applied as an all-purpose title; anyone can use it. Many people might dislike using it, as it has been commonly used to describe people whose binary gender one is unable to tell from appearance. However, it's in the process of being reclaimed from the binary/cisnormative.