Canon EOS Rebel T1i Instruction Manual page 239

Nomenclature
Power switch
<Z> ISO speed
setting button
<6>
Main Dial
Shutter
button
<O> Aperture/Exposure
compensation button
Display-off
sensor
<A> Live View shooting/
Movie shooting button
Mode Dial
Focus mode switch
<0> Setting button
<D>
Flash button
<A> AE lock button
<S> AF point
selection button
<S>
Cross keys
Access lamp
239