The T( ) function stands for TEXT.
If the value being evaluated by the function is text, it returns that value. Otherwise, it returns the blank string "" (except if the value being evaluated is a logical error, for example, #N/A).
Sheet1
<TABLE style="PADDING-RIGHT: 2pt; PADDING-LEFT: 2pt; FONT-SIZE: 10pt; FONT-FAMILY: Verdana,Arial; BACKGROUND-COLOR: #ffffff" cellSpacing=0 cellPadding=0 border=0><COLGROUP><COL style="FONT-WEIGHT: bold; WIDTH: 30px"><COL style="WIDTH: 72px"><COL style="WIDTH: 72px"></COLGROUP><TBODY><TR style="FONT-WEIGHT: bold; FONT-SIZE: 8pt; BACKGROUND-COLOR: #cacaca; TEXT-ALIGN: center"><TD> </TD><TD>A</TD><TD>B</TD></TR><TR style="HEIGHT: 17px"><TD style="FONT-SIZE: 8pt; BACKGROUND-COLOR: #cacaca; TEXT-ALIGN: center">1</TD><TD style="BORDER-RIGHT: #000000 1px solid; BORDER-TOP: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">text</TD><TD style="BORDER-RIGHT: #000000 1px solid; BORDER-TOP: #000000 1px solid; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">text</TD></TR><TR style="HEIGHT: 17px"><TD style="FONT-SIZE: 8pt; BACKGROUND-COLOR: #cacaca; TEXT-ALIGN: center">2</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">10</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid"> </TD></TR><TR style="HEIGHT: 17px"><TD style="FONT-SIZE: 8pt; BACKGROUND-COLOR: #cacaca; TEXT-ALIGN: center">3</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">#N/A</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">#N/A</TD></TR><TR style="HEIGHT: 17px"><TD style="FONT-SIZE: 8pt; BACKGROUND-COLOR: #cacaca; TEXT-ALIGN: center">4</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">this</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">this</TD></TR><TR style="HEIGHT: 17px"><TD style="FONT-SIZE: 8pt; BACKGROUND-COLOR: #cacaca; TEXT-ALIGN: center">5</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT: #000000 1px solid; COLOR: #ffffff; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center">_</TD><TD style="BORDER-TOP-WIDTH: 1px; BORDER-RIGHT: #000000 1px solid; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-BOTTOM: #000000 1px solid"> </TD></TR></TBODY></TABLE>
Formula entered in B1 and copied down to B5:
=T(A1)