What does below pictogram mean?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

What is the Surname of Barbie Doll?

What Adam and Eve do not have but the rest of the people have?

Make a sentence consisting of three words that have the whole alphabet.

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?