Yes, a pico second is a thousandth of a nano second.
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"milli-" = 1/1,000 (thousandth) "micro-" = 1/1,000,000 (millionth) "nano-" = 1/1,000,000,000 (billionth) "pico-" = 1/1,000,000,000,000 (millionth of a millionth, "micro micro-")
nano watt
milli is 10^3 bigger then micro. milli is 10^6 bigger then nano. milli is 10^9 bigger then pico.
Nano second maybe?
They are different prefixes for amounts less than unity:kilo = 1/1000micro = 1/1,000,000nano = 1/1,000,000,000pico = 1/1,000,000,000,000