10^-3

http://www.google.com/search?source=ig&hl=en&rlz=1G1GGLQ_ENUS308&q=10%5E-3+&aq=f&aqi=h1g10&aql=&oq=&gs_rfai=CKOVFFiZ8TMjvD5HCNrjQsLQEAAAAqgQFT9AJxLg