Interpreting sensor names
I've found this page http://www.parhelia.ch/blog/statics/k3_keys.html (archived) explaining vast majority of SMC keys.
As for your question, I believe that TA0P and TA0p is the same thing. A0 means ambient sensor #0 and p means proximity.
TC-- are sensors for CPU/logic board.
Latest D means CPU die (sensor), and H refers to heatsink.
PECI CPU : TCXC
PECI CPU : TCXc
CPU 1 Proximity : TC0P
CPU 1 Heatsink : TC0H
CPU 1 Package : TC0D
CPU 1 : TC0E
CPU 1 : TC0F
CPU Core 1 : TC1C
CPU Core 2 : TC2C
CPU Core 3 : TC3C
CPU Core 4 : TC4C
CPU Core 5 : TC5C
CPU Core 6 : TC6C
CPU Core 7 : TC7C
CPU Core 8 : TC8C
CPU 1 Heatsink Alt. : TCAH
CPU 1 Package Alt. : TCAD
CPU 2 Proximity : TC1P
CPU 2 Heatsink : TC1H
CPU 2 Package : TC1D
CPU 2 : TC1E
CPU 2 : TC1F
CPU 2 Heatsink Alt. : TCBH
CPU 2 Package Alt. : TCBD
PECI SA : TCSC
PECI SA : TCSc
PECI SA : TCSA
PECI GPU : TCGC
PECI GPU : TCGc
GPU Proximity : TG0P
GPU Die : TG0D
GPU Die : TG1D
GPU Heatsink : TG0H
GPU Heatsink : TG1H
Memory Proximity : Ts0S
Mem Bank A1 : TM0P
Mem Bank A2 : TM1P
Mem Bank B1 : TM8P
Mem Bank B2 : TM9P
Mem Module A1 : TM0S
Mem Module A2 : TM1S
Mem Module B1 : TM8S
Mem Module B2 : TM9S
Northbridge Die : TN0D
Northbridge Proximity 1 : TN0P
Northbridge Proximity 2 : TN1P
MCH Die : TN0C
MCH Heatsink : TN0H
PCH Die : TP0D
PCH Die : TPCD
PCH Proximity : TP0P
Airflow 1 : TA0P
Airflow 2 : TA1P
Heatpipe 1 : Th0H
Heatpipe 2 : Th1H
Heatpipe 3 : Th2H
Mainboard Proximity : Tm0P
Powerboard Proximity : Tp0P
Palm Rest : Ts0P
BLC Proximity : Tb0P
LCD Proximity : TL0P
Airport Proximity : TW0P
HDD Bay 1 : TH0P
HDD Bay 2 : TH1P
HDD Bay 3 : TH2P
HDD Bay 4 : TH3P
Optical Drive : TO0P
Battery TS_MAX : TB0T
Battery 1 : TB1T
Battery 2 : TB2T
Battery : TB3T
Power Supply 1 : Tp0P
Power Supply 1 Alt. : Tp0C
Power Supply 2 : Tp1P
Power Supply 2 Alt. : Tp1C
Power Supply 3 : Tp2P
Power Supply 4 : Tp3P
Power Supply 5 : Tp4P
Power Supply 6 : Tp5P
Expansion Slots : TS0C
PCI Slot 1 Pos 1 : TA0S
PCI Slot 1 Pos 2 : TA1S
PCI Slot 2 Pos 1 : TA2S
PCI Slot 2 Pos 2 : TA3S
CPU Core 1 : VC0C
CPU Core 2 : VC1C
CPU Core 3 : VC2C
CPU Core 4 : VC3C
CPU Core 5 : VC4C
CPU Core 6 : VC5C
CPU Core 7 : VC6C
CPU Core 8 : VC7C
CPU VTT : VV1R
GPU Core : VG0C
Memory : VM0R
PCH : VN1R
MCH : VN0C
Mainboard S0 Rail : VD0R
Mainboard S5 Rail : VD5R
12V Rail : VP0R
12V Vcc : Vp0C
Main 3V : VV2S
Main 3.3V : VR3R
Main 5V : VV1S
Main 5V : VH05
Main 12V : VV9S
Main 12V : VD2R
Auxiliary 3V : VV7S
Standby 3V : VV3S
Standby 5V : VV8S
PCIe 12V : VeES
Battery : VBAT
CMOS Battery : Vb0R
CPU Core : IC0C
CPU VccIO : IC1C
CPU VccSA : IC2C
CPU Rail : IC0R
CPU DRAM : IC5R
CPU PLL : IC8R
CPU GFX : IC0G
CPU Memory : IC0M
GPU Rail : IG0C
Memory Controller : IM0C
Memory Rail : IM0R
MCH : IN0C
Mainboard S0 Rail : ID0R
Mainboard S5 Rail : ID5R
Misc. Rail : IO0R
Battery Rail : IB0R
Charger BMON : IPBR
CPU Core 1 : PC0C
CPU Core 2 : PC1C
CPU Core 3 : PC2C
CPU Core 4 : PC3C
CPU Core 5 : PC4C
CPU Core 6 : PC5C
CPU Core 7 : PC6C
CPU Core 8 : PC7C
CPU Cores : PCPC
CPU GFX : PCPG
CPU DRAM : PCPD
CPU Total : PCTR
CPU Total : PCPL
CPU Rail : PC1R
CPU S0 Rail : PC5R
GPU Total : PGTR
GPU Rail : PG0R
Memory Rail : PM0R
MCH : PN0C
PCH Rail : PN1R
Mainboard S0 Rail : PC0R
Mainboard S0 Rail : PD0R
Mainboard S5 Rail : PD5R
Main 3.3V Rail : PH02
Main 5V Rail : PH05
12V Rail : Pp0R
Main 12V Rail : PD2R
Misc. Rail : PO0R
Battery Rail : PBLC
Battery Rail : PB0R
DC In Total : PDTR
System Total : PSTR
Source: http://jbot-42.github.io/Articles/smc.html (archived)