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Abbreviation used in reference projects
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A
ACM             Abstract Control Model
ACT             Activity, Active
ADR             Address
ALLOC           Allocation
ALT             Alternate
AUX             Auxiliary

B
BD              Buffer Descriptor
BDT             Buffer Descriptor Table
BUFF            Buffer

C
CDC             Communication Device Class
CFG             Configuration
CLR             Clear
CLS             Class
CTRL            Control

D
DC              Device Class
DEF             Definition
DEFS            See DEF
DEV             Device
DIR             Direction
DSC             Descriptor

E
ENDP            Endpoint
EP              Endpoint
EXT             External

F
FN              Functional
FS              Full-Speed

H
HID             Human Interface Device

I
INIT            Initialize
INT             Interrupt / Internal
INTF            Interface
IO              Input/Output
ISOCH           Isochronous
ISR             Interrupt Service Routine

L
LANG            Language
LEN             Length
LS              Low-Speed

M
MAX             Maximum
MCHP            Microchip Technology
MEM             Memory
MFR             Manufacturer, Manufacturing, Manufacture
MGT             Management
MIN             Minimum
MSD             Mass Storage Device

N
NUM             Number

O
OP              Operational

P
PKT             Packet
PID             Packet ID
PP              Ping-Pong
PREP            Preparation
PTR             Pointer

R
RDY             Ready
REG             Register
REQ             Request
RCPT            Recipient
RPT             Report
RWU             RemoteWakeup
RX              Receive

S
SIE             Serial Interface Engine
STAT            Status
STD             Standard
SYNCH           Synchronous,Synchronization
SYS             System

T
TEL             Telephone
TR              Tranceiver
TRF             Transfer
TX              Transmit

U
USB             Universal Serial Bus
UTIL            Utility

V
VAR             Variable
VAL             Value
VEND            Vendor

Z
ZLP             Zero Length Packet

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