> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Acronyms and terms

Sensors-related acronyms and expansions for better understanding.

**Table : Acronyms and terms**

<table>
  <thead>
    <tr><th>Acronym or term</th><th>Definition</th></tr>
  </thead>

  <tbody>
    <tr><td>aDSP</td><td>Application digital signal processor</td></tr>
    <tr><td>ALS</td><td>Ambient light sensor</td></tr>
    <tr><td>AMD</td><td>Absolute motion detector</td></tr>
    <tr><td>ASCP</td><td>Asynchronous COM port</td></tr>
    <tr><td>DPC</td><td>Device position classifier</td></tr>
    <tr><td>DRI</td><td>Data ready interrupt</td></tr>
    <tr><td>EIS</td><td>Electronic image stabilization</td></tr>
    <tr><td>FFT</td><td>fast Fourier transform</td></tr>
    <tr><td>FIFO</td><td>First-in, first-out</td></tr>
    <tr><td>GRV</td><td>Game rotation vector</td></tr>
    <tr><td>HAL</td><td>Hardware abstraction layer</td></tr>
    <tr><td>HLOS</td><td>High-level operating system</td></tr>
    <tr><td>I<sup>2</sup>C</td><td>Inter-integrated circuit</td></tr>
    <tr><td>I<sup>3</sup>C</td><td>Improved I<sup>2</sup>C</td></tr>
    <tr><td>IBI</td><td>In-band interrupt</td></tr>
    <tr><td>IIR</td><td>Infinite impulse response</td></tr>
    <tr><td>IMU</td><td>Inertial measurement unit</td></tr>
    <tr><td>IPC</td><td>Interprocessor communication</td></tr>
    <tr><td>MCPS</td><td>Million cycles per second</td></tr>
    <tr><td>MTU</td><td>Maximum transmission unit</td></tr>
    <tr><td>ODR</td><td>Output data rate</td></tr>
    <tr><td>OSA</td><td>OS abstraction</td></tr>
    <tr><td>PAL</td><td>Platform abstraction layer</td></tr>
    <tr><td>PD</td><td>Protection domain</td></tr>
    <tr><td>QSH</td><td>Qualcomm sensing hub</td></tr>
    <tr><td>QuP</td><td>Qualcomm universal peripherals</td></tr>
    <tr><td>QuRT</td><td>Qualcomm Real-Time Operating System</td></tr>
    <tr><td>RMD</td><td>Relative motion detector</td></tr>
    <tr><td>RTOS</td><td>Real-time operating system</td></tr>
    <tr><td>RV</td><td>Rotation vector</td></tr>
    <tr><td>SCP</td><td>Synchronous COM port</td></tr>
    <tr><td>SCons</td><td>Software construction</td></tr>
    <tr><td>SMD</td><td>Significant motion detector</td></tr>
    <tr><td>SMP2P</td><td>Shared memory point to point</td></tr>
    <tr><td>SoC</td><td>System-on-chip</td></tr>
    <tr><td>SPI</td><td>Serial peripheral interface</td></tr>
    <tr><td>SSC</td><td>Qualcomm® Snapdragon™ sensors core</td></tr>
    <tr><td>SUID</td><td>Sensor unique identifier</td></tr>
    <tr><td>UART</td><td>Universal asynchronous receiver/transmitter</td></tr>
  </tbody>
</table>