ready reckoners 174
reckoning 120, 121, 127, 131
record-keeping 74, 83, 85, 86–7
Regensburg 161–2
Renaissance 117, 172, 184
Rennell, Solomon Islands 248–9
Rift Valley 33
rods, counting 5, 187, 191–5, 192, 196–9
Roman Empire 99
Arabic number symbols and 159–60
counting boards and 120–1, 127, 198, 288
finger-counting system 112–17, 113, 149, 219
‘Roman computation’ (pamphlet) 116
Roman numerals 105–7, 118, 120–1, 132–3, 161, 162, 164, 165, 182, 183, 288
Royal Gardens at Kew 179
Royal Society of London 174, 175–6
rule of three 170
Russian River people 264
Sahul 231
Salote Tupou III of Tonga, Queen 245
Samoan language 248, 249, 251
Sanskrit 134, 136–40, 143, 146, 149, 155, 158–9, 163
Santa Barbara Channel 264
schoty 198
scribes 1, 79, 80, 81, 82, 83, 84, 88, 89–91, 89, 92–5, 118, 122, 150
sea turtle eggs 228
Sebokht, Bishop 148, 157
Semitic language family 85, 95, 119, 148
Shakespeare, William 15, 125
Shaw Billings, John 208
shell
beads 35, 39, 264, 266, 267, 268
money 262–9, 263
shouting vote 107
Sia Yoon 215–16, 216, 218, 220–4
sifr (Arabic zero) 158, 168
Smyrna 117
social media 215–16, 216, 218, 220–4
soroban (abacus) 186, 196–203, 198, 289
South Asia 134–5, 136, 141
