“त्रसकाय” (Trasakāy) in Jainism means:

Mobile living beings – i.e. those jīvas (souls) who can move by themselves and have more than one sense (two to five senses), such as:

• worms, ants, fish
• birds
• animals
• human beings
• heavenly and hellish beings

So, in simple English, “trasakāy” = mobile (moving) living beings with 2–5 senses.