Pixel Barrel : TPB
Pixel Forward: TPF
             : TPFP (plus z pixel forward)
             : TPFM (minus z pixel forward)
Inner Barrel : TIB  
Outer Barrel : TOB
Inner Disks  : TID  (these are the 3 small disks)
             : TIDP (plus z Inner Endcap)
             : TIDM (minus z Inner Endcap)
End Cap      : TEC
             : TECP (plus z Forward Detector)
             : TECM (minus z Forward Detector

Numbering : Barrel layers get numbers starting from 
            the inside

Pixel Barrel layers :
TPB1
TPB2
(TPB3)

Inner Barrel layers :
TIB1
TIB2
TIB3
TIB4

Outer Barrel layers :
TOB1
TOB2
TOB3
TOB4
TOB5
TOB6

Forward Disks :
Numbering of Disks starts from the inside
Numbering of Petals starts from phi = 0 and is clockwise when looking from
minus z towards plus z ("one stands on the Saleve and looks towards
the Jura")
Numbering of Rings starts from the inside

Pixel Forward Disks :
TPFP1
TPFP2
(TPFP3)

TPFM1
TPFM2
(TPFM3)

Inner Disks :
TIDP1
TIDP2
TIDP3

TIDM1
TIDM2
TIDM3

Forward Disks :
TECP1
TECP2
TECP3
TECP4
TECP5
TECP6
TECP7
TECP8
TECP9

TECM1
TECM2
TECM3
TECM4
TECM5
TECM6
TECM7
TECM8
TECM9

Petals and Rings Example for TECP1 Disk :

TECP1P1
       TECP1P1R1
       TECP1P1R2
       TECP1P1R3
       TECP1P1R4
       TECP1P1R5
       TECP1P1R6
       TECP1P1R7 
TECP1P2
TECP1P3
TECP1P4
TECP1P5
TECP1P6
TECP1P7
TECP1P8
TECP1P9
TECP1P10
TECP1P11
TECP1P12
TECP1P13
TECP1P14
TECP1P15
TECP1P16

Comment 1 : the numbering in the Aachen drawings for the petals does
          not yet follow this convention as it does not start counting
          from phi = 0.
Comment 2 : One could go further down by specifying "Front" and "Back"
            and Petal Sides (A/B/C/D)