As the others said, symbols are some kind of string that are unique in the image. I would like to talk also about a super cool feature.��

A Block can receive the message #value:. For example when you do a #do: on a collection, the block will receive multiple #value: message with the element in argument.��

[ :class | class allSubclasses] value: Object.

And the cool feature is that Symbol also have this method, so with the polymorphism you can do:

#AllSubclasses value: Object

{ Object . Morph . Integer . Float } collect: #allSubclasses

This is a pretty cool feature that I wanted to share.

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Thanks in advance for your answer.
Valentin Ryckewaert