LETTER_WIDTH=10;
LETTER_HEIGHT=30;

LETTER_HEIGHT_13=LETTER_HEIGHT/3;
LETTER_HEIGHT_23=LETTER_HEIGHT*2/3;
LETTER_HEIGHT_12=LETTER_HEIGHT/2;

// m
polygon(points=[[0,LETTER_HEIGHT_23], [0, LETTER_HEIGHT_13], [LETTER_WIDTH, LETTER_HEIGHT_23], [LETTER_WIDTH, LETTER_HEIGHT]]);
translate([LETTER_WIDTH*2, 0])
polygon(points=[[0,LETTER_HEIGHT_23], [0, LETTER_HEIGHT/3], [LETTER_WIDTH/2, LETTER_HEIGHT_23], [LETTER_WIDTH/2, LETTER_HEIGHT]]);
translate([LETTER_WIDTH*3.5, 0])
polygon(points=[[0,LETTER_HEIGHT_23], [0, LETTER_HEIGHT/3], [LETTER_WIDTH/2, LETTER_HEIGHT_23], [LETTER_WIDTH/2, LETTER_HEIGHT]]);

translate([LETTER_WIDTH, 0])
square([LETTER_WIDTH, LETTER_HEIGHT]);
translate([LETTER_WIDTH*2.5, 0])
square([LETTER_WIDTH, LETTER_HEIGHT]);
translate([LETTER_WIDTH*4, 0])
square([LETTER_WIDTH, LETTER_HEIGHT]);