RUL	Remaining Useful Life
MIG-HI	Mechanism-Informed Gated Health Indicator
CETI	Causal Evidence-Driven Transition Identification
SCDB-LSTM	Stage-Conditioned Dual-Branch Long Short-Term Memory Network
FPT	First Prediction Time
HI	Health Indicator
MAE	Mean Absolute Error
RMSE	Root Mean Square Error
LSTM	Long Short-Term Memory
MAD	Median Absolute Deviation
BPFO	Ball-Pass Frequency of the Outer Race
BPFI	Ball-Pass Frequency of the Inner Race
BSF	Ball Spin Frequency
FTF	Fundamental Train Frequency
RMS	Root Mean Square
PCA	Principal Component Analysis
CPU	Central Processing Unit
GPU	Graphics Processing Unit
EWMA	Exponentially Weighted Moving Average
RMS-HI	Root-Mean-Square-Based Health Indicator
PCA-HI	Principal-Component-Analysis-Based Health Indicator
GRU	Gated Recurrent Unit
TCN	Temporal Convolutional Network
CNN	Convolutional Neural Network
MSE	Mean Squared Error