Abbreviation	Definition	Unit
ANN	Artificial neural network	-
BCC	Body-centered cubic	-
C	Rod-length configuration in specimen coding	-
CFE	Crushing force efficiency	%
CFEIPCF	Crushing force efficiency based on initial peak crushing force	%
CFEPCF	Crushing force efficiency based on peak crushing force	%
CFRP	Carbon fiber-reinforced polymer	-
DLP	Digital light processing	-
EA	Energy absorption	J
F(s)	Crushing force as a function of displacement	N
FCC	Face-centered cubic	-
G	Graded rod-length configuration containing short, medium, and long CFRP rods	-
GPR	Gaussian process regression	-
IPA	Isopropyl alcohol	-
IPCF	Initial peak crushing force	N
KC-E	Empty Kelvin-cell lattice	-
L	Long CFRP rod	mm
m	Specimen mass	g
M	Medium CFRP rod	mm
MAE	Mean absolute error	-
MCF	Mean crushing force	N
MSLA	Masked stereolithography	-
N	Number of CFRP rods in specimen coding	-
N5	Specimen group reinforced with 5 CFRP rods	-
N13	Specimen group reinforced with 13 CFRP rods	-
P	CFRP rod placement pattern in specimen coding	-
P1	Core-dominated CFRP rod placement pattern	-
P2	Frame-type CFRP rod placement pattern	-
P3	Distributed CFRP rod placement pattern	-
PCF	Peak crushing force	N
RMSE	Root mean square error	-
RT	Regression tree	-
S	Short CFRP rod	mm
s	Deformation displacement	mm
SEA	Specific energy absorption	J/g
SVM	Support vector machine	-
U30	Uniform rod-length configuration with 30 mm CFRP rods	-
U40	Uniform rod-length configuration with 40 mm CFRP rods	-
U50	Uniform rod-length configuration with 50 mm CFRP rods	-
50/50	Hybrid rod-length configuration containing short and long CFRP rods	-