If you don't come from Rebol it would probably be weird to you that there are many specific word-types in Rye.

    name: Janko ; name: is a set-word - it binds value to a word
    ?print      ; ?print is a get-word - it get's value word is bound to in this case a print builtin function
    :age        ; left leaning set-word (this is get-word in Rebol)
    what?       ; just a regular word
    ...

name get's the value anyway, so we don't need to use ?name but if word is bound to a function just invoking a word will evaluate a function and if we want to return a funtion we use get-word. which has ? in front.

? at the end is just a regular word and a (currently accepted) naming convention where noun? means get-noun. so length? in instead of get-length etc.

Rebol used ? at the end convention for more things, a lot for boolean results, testing of types, like string? and positive? but also for lenght?

For booleans current Rye's naming convention is that we use is-adjective. Rebol used positive? to test if value is positive. We would in this way use is-positive.

The conventions might change if we see that there are ways that make more sense and are also consistent.

Thanks for the explanations. Indeed I don't come from Rebol and the conventions seem like a terra incognita, although I can sense a significant value in them.

From a past romance with Forth I see in general how concatenative languages seem to be underappreciated a bit