What is the default bruteforce charset?

[cybhashcat]

Hello!
i can't seem to find the answer to this anywhere...
when i do the simple command:
oclHashcat64.exe -m 300 -a 3 E:\Hash\hash.txt

in the hopes of bruteforcing a password, is it only the "basic" 62 charset? (numbers, small-case letters, upper-case letters)? or symbols as well?

and if i want to include all symbols, what exactly should i be adding to my command?

Alternatively, if "all symbols" is too much, what i usually recommended/used?
thank you!