Time for something fun! Mesurements. Ok, I admit it, this one is more for me to have reference material, but if you're interested, don't let that stop you.
Now we got rid of th-. . . Nah just kidding. It really is measurements.
In Erondia they use a set of measurements mainly based off the human body. A small object (such as a fork or a daggers length) will be mesured in digits - roughly equivalent to an inch (a digit is 1/16 of a foot or 3/4 of an inch). A longer dagger might be measured in palms or - defined as half a foot, so 4 digits is the same as 1 palm. As the digit is based on the width of a finger, 5 digits is often called a hand, although this is usually used informally in jest. A span is equal to 3 palms, and is used for measuring swords. A foot is 16 digits, or 4 spans - and is used to measure hight of people - further mesurements are given in spans informally (so 6'3" would be 6 feet and 1 span, usually said "Six foot one"). If further detail is needed, quater and half spans (digits) are used in addition to this. Someone who was almost 6'4" would be 6 ft 1 span, 1 digit which is usualy said "Six foot one and quater").
Longer lengths are an ell (based off the length from fingertip to elbow, and is 6 palms or 1.5 feet), an ald (based off a mans outstreached arms and is 4 ells or 6 feet (roughly 2m)), and more commonly used pace (baced upon the measure of a full stride ie.
the position of the heel when it is raised from the ground to the point the same heel is set down again at the end of the step. Thus, a distance can be "paced off" by counting each time the same heel touches ground, or in other words, every other step The stride is standardised at 5ft). A pace is used to measure length on the ground, where an ald is used for cloths, or lengths of movable objects. Alds are also used to describe the heigts of walls accurately, as an ald can be approximated as the height of an average man. A Pend is 5 alds or 30 feet (roughly 10m). Pends are used to measure medium lengths, like short fences, and hallways.
An Erondian Mile is 1'000 Strides (5'000 ft or ~1524m). A quater mile (250 strides) is often informally called a Wald, and a fifth of a wald (1/20 Erondian miles) is called a Kiln, and a fith of a kiln is a wald. One Dek is a fifth of a wald, but is also 10 strides (50 ft or roughly 15m).
This can be summed up as:
1 palm = 4 digits
1 hand = 5 digits
1 foot = 4 palms = 16 digits
1 Span = 3 palms
1 Ell = 2 spans = 1.5 feet = 6 palms = 24 digits
1 Stride= 5 feet = 16 hands = 20 palms = 80 digits
1 Ald = 4 ells = 6 feet = 8 spans = 24 palms = 96 digits
1 Pend = 5 alds = 6 strides = 30 feet = 40 spans = 76 hands = 80 palms = 480 digits
1 Dek = 10 strides = 50 feet = 160 hands = 200 palms = 800 digits
1 Kiln = 50 strides = 200 hands = 275 feet = 1'000 spans = 5'000 digits
1 Wald = 250 strides = 1'000 hands = 1'250 feet = 5'000 spans = 20'000 digits
1 Mile (Erondian) = 4 walds = 1'000 Strides = 4'000 hands = 5'000 feet = 20'000 spans = 80'000 digits.