complete, finish
了 centers on bringing something to its end point: completing a task or finishing an action. The idea is a clean, final closure.
了 is thought to depict a child wrapped in swaddling cloth, symbolizing completion or finishing. The modern form retains the simple hooked shape.
See the single hooked stroke as a final checkmark: 了 marks something as done and complete.
For リョウ, imagine finishing a long journey and finally reaching a peaceful ryokan (りょかん, Japanese inn): ryokan -> リョウ, and the task is complete.
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end; close; conclusion; termination
completion; conclusion
comprehension; consent; understanding; agreement
acknowledgement; acknowledgment; understanding; approval; consent
finish; completion; the end
charm; fascination
completion (of a course)
expiration; termination
finishing reading
resignation; giving up the game for lost
idea; thought; intention; design; view; inclination; decision; motive
unfinished; unfilled (order); unexecuted
proofreading completed
acknowledgement; acknowledgment; understanding; approval; consent
please be aware (that ...); please note (that ...); please understand (that ...)
error termination; terminate with error
ready-to-commit state
end of service (esp. of an online server); termination of service
dialogue establishment indication outstanding
dialogue establishment request outstanding