One can write a string vector to stdout using 1 and -1. The difference is that -1 appends a newline after the string, whereas 1 does not. Note: this expression has a return value of 1 or -1, respectively, which will print as well if not suppressed.
q)1 "String vector here\n" String vector here 1 q)-1 "String vector here" / equivalent String vector here -1
This is a special case of send to handle.