What is a non-gender specific way to specify a group of people when writing Chinese
他们 - "they" (men / men and women )

她们 - "they" (women )

它们 - "they" (objects)

*The term "它们" is rarely used. Most of the time, people would use "这些" (these)+ object or "那些"(those)+ object when referring a group of objects.