other, another, the others
他 centers on the idea of something outside the current focus: another person, a different thing, or the rest of a group. It marks what is not the self or not the one under discussion.
他 combines the person radical 亻 with 也, which likely contributed the sound and originally depicted a snake or a container. The exact historical development of the compound is uncertain, but the character has long been used to express otherness or a third person.
A person 亻 beside a scorpion-like shape 也: imagine pointing to someone else across the room, saying 'that other person, not me.' The scorpion shape helps you remember it's a different, separate entity.
For タ, picture a tarot card reader pointing to another card: 'that other card' -> タ. The person radical 亻 is the reader, and 也 is the mysterious other card.
other (esp. people and abstract matters)
another place; some other place; somewhere else; outside
the rest; the others
another person; other people; others
another company; other company
another person; others
foreign country; another country
one (esp. of two); the other; one way; the other way; one direction; the other direction; one side; the other side; one party; the other party
another place; somewhere else; elsewhere
death; the next world
exclusion
another school; other schools
oneself and others
sanity; soundness of mind; prudence and discretion
altruism
murder
altruism
salvation by faith in Amitabha
other intention; hidden purpose; ulterior motive; ill will; malice
home in which a woman stays during her period (or while giving birth)