Threads

This column displays the number of threads for the current process. This column is present only in the Solaris 2 port of top.

For Solaris, this number is actually the number of lightweight processes (lwps) created by the threads package to handle the threads. Depending on current resource utilization, there may not be one lwp for every thread. Thus this number is actually less than or equal to the total number of threads created by the process.