L or croi<chr_var letter="s" var="long">∫</chr_var>t lor force <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> <chr_var letter="s" var="long">∫</chr_var>e<chr_var letter="s" var="long">∫</chr_var><chr_abbr type="reg" class="dc" expan="un" cert="no">u-hbar</chr_abbr>tu<chr_abbr type="reg" class="dc" expan="ent" cert="no">et-hbar</chr_abbr> 