It is sometimes abbreviated to cu m , NUMBER@1 , m ^ NUMBER@2 or m ** NUMBER@2 when superscript characters or markup can not be used -LRB- i.e. in some typewritten documents and postings in Usenet newsgroups -RRB- .

It is sometimes abbreviated cu m , NUMBER@1 , m ^ NUMBER@2 or m ** NUMBER@2 when superscript characters or markup are not available/accessible -LRB- i.e. in some typewritten documents and postings in Usenet newsgroups -RRB- .
