full meaning of each rails on iPhone

i want to know full meaning of iphone voltage, data rails

ex:

AP_BI_BB_HSIC1_DATA

AP_BI_BB_HSIC1_STB

AP_BI_BB_HSIC1_DATA

AP_BI_BB_HSIC1_STB

AP_BI_TRISTAR_USB0_P

AP_BI_TRISTAR_USB0_N

AP_TO_PMU_TEST_CLKOUT

BUTTON_TO_AP_HOLD_KEY_L

PP1V8_SDRAM

AP_TO_PMU_SOCHOT1_L_R

PP1V8

AP_BI_EEPROM_I2C_SDA

OSCAR_TO_AP_ISP_UART_RXD

PP1V8

AP_BI_I2C2_SDA

AP_TO_I2C1_SCL

AP_TO_I2C0_SCL

AP_TO_I2C2_SCL

45_AP_TO_PMU_AND_BL_DWI_CLK

AP_BI_I2C1_SDA

AP_BI_I2C0_SDA

45_AP_TO_PMU_AND_BL_DWI_DO

AP_TO_CODEC_ASP_I2S0_LRCLK

CODEC_TO_AP_ASP_I2S0_DIN

AP_TO_CODEC_ASP_I2S0_DOUT

45_AP_TO_BT_I2S1_BCLK

AP_TO_BT_I2S1_DOUT

45_AP_TO_SPKAMP_I2S2_MCLK_R

MESA_TO_AP_INT

AP_TO_MESA_SPI_MOSI

MESA_TO_AP_SPI_MISO

AP_TO_TOUCH_SPI_CS_L

AP_TO_TOUCH_SPI_MOSI

TOUCH_TO_AP_SPI_MISO

AP_TO_CODEC_SPI_CS_L

AP_TO_CODEC_SPI_CLK

CODEC_TO_AP_SPI_MISO

BOARD_ID1

BOARD_ID2

TRISTAR_TO_AP_INT

AP_TO_CODEC_VSP_I2S4_LRCLK

AP_TO_CODEC_VSP_I2S4_DOUT

CODEC_TO_AP_VSP_I2S4_DIN

45_AP_TO_CODEC_VSP_I2S4_BCLK

AP_TO_BB_I2S3_LRCLK

BB_TO_AP_I2S3_DIN

AP_TO_BB_I2S3_DOUT

ALS_TO_AP_INT_L

45_AP_TO_CODEC_XSP_I2S2_BCLK

CODEC_TO_AP_XSP_I2S2_DIN

AP_TO_CODEC_XSP_I2S2_DOUT

AP_TO_CODEC_XSP_I2S2_LRCLK

45_AP_TO_BB_I2S3_BCLK

AP_TO_BT_I2S1_LRCLK

BT_TO_AP_I2S1_DIN

45_AP_TO_CODEC_ASP_I2S0_BCLK

45_AP_TO_CODEC_I2S0_MCLK_R

45_AP_TO_TOUCH_CLK32K_RESET_L

PMU_TO_AP_PRE_UVLO_L_R

AP_ISP_TO_OSCAR_UART_TXD

AP_TO_EEPROM_I2C_SCL

AP_TO_EEPROM_I2C_SCL

PP1V8

AP_BI_EEPROM_I2C_SDA

AP_TO_PMU_SOCHOT1_L

PP1V8_SDRAM

45_AP_TO_SPKAMP_I2S2_MCLK

45_AP_TO_CODEC_I2S0_MCLK

PMU_TO_AP_PRE_UVLO_L

AP_TO_MESA_SPI_CLK_R

AP_TO_MESA_SPI_CLK

AP_TO_CODEC_SPI_MOSI

AP_TO_TOUCH_SPI_CLK

AP_TO_OSCAR_UART_TXD

OSCAR_TO_AP_UART_RXD

AP_TO_WLAN_DEVICE_WAKE

STOCKHOLM_TO_AP_UART3_RXD

AP_TO_STOCKHOLM_UART3_RTS_L

STOCKHOLM_TO_AP_UART3_CTS_L

AP_TO_BB_UART2_TXD

BB_TO_AP_UART2_RXD

AP_TO_BB_UART2_RTS_L

BB_TO_AP_UART2_CTS_L

AP_TO_RADIO_ON_L

CODEC_TO_AP_INT_L

BOOT_CONFIG1

BB_TO_AP_GPS_SYNC

AP_TO_BB_HOST_RDY

AP_TO_BB_WAKE_MODEM

AP_TO_PMU_KEEPACT

AP_TO_STOCKHOLM_SIM_SEL

BB_TO_AP_IPC_GPIO1

AP_TO_WLAN_JTAG_SWDIO

PMU_TO_AP_IRQ_L

BUTTON_TO_AP_MENU_KEY_L

AP_TO_WLAN_JTAG_SWCLK

AP_TO_SPKAMP_BEE_GEES

AP_TO_SPKAMP_RESET_L

AP_TO_BB_RST_L

AP_TO_BT_WAKE

AP_TO_HEADSET_HS3_CTRL

AP_TO_HEADSET_HS4_CTRL

BUTTON_TO_AP_VOL_UP_L

BUTTON_TO_AP_VOL_DOWN_L

SPKAMP_TO_AP_INT_L

TRISTAR_TO_AP_ACC_UART6_RXD

AP_TO_TRISTAR_ACC_UART6_TXD

AP_TO_TIGRIS_SWI

AP_TO_WLAN_UART4_RTS_L

WLAN_TO_AP_UART4_CTS_L

AP_TO_BT_UART1_TXD

BT_TO_AP_UART1_RXD

AP_TO_BT_UART1_RTS_L

BT_TO_AP_UART1_CTS_L

AP_TO_TRISTAR_DEBUG_UART0_TXD

TRISTAR_TO_AP_DEBUG_UART0_RXD

AP_TO_VIBE_TRIG

OSCAR_BI_AP_TIME_SYNC_HOST_INT

WLAN_TO_AP_UART4_RXD

AP_TO_STOCKHOLM_UART3_TXD

AP_TO_WLAN_UART4_TXD

FORCE_DFU

BB_TO_AP_RESET_DET_L

BB_TO_AP_DEVICE_RDY

AP_TO_BB_COREDUMP

BB_TO_AP_IPC_GPIO

BUTTON_TO_AP_RINGER_A

BOARD_REV2

BOARD_REV0

AP_TO_VIBE_EN

can any one explain full meaning??