A – AT&T Park. The iconic stadium that is home to the San Francisco Giants Major League Baseball team will host the first Rugby World Cup event to be staged in North America

B – Beatriz Muhlbauer. The Brazilian is one of sevens players in San Francisco who have been part of every women's RWC Sevens. The others are England's Claire Allan and Heather Fisher, France captain Fanny Horta, South Africa's Zenay Jordaan and Spain duo Marina Bravo and Barbara Pla.

C – Captains. The last captains to lift the two coveted trophies were DJ Forbes and Huriana Manuel of New Zealand in 2013.

D – Drop goals. There has been just one in RWC Sevens history, kicked by Isi Tu'ivai in Tonga's 10-7 win over Australia in the inaugural tournament in 1993.

E – England. Winners of the inaugural RWC Sevens held at Murrayfield in 1993

F – Firsts. Fiji played Latvia in the first-ever RWC Sevens match back in 1993, while Australia beat China in the first women's encounter in 2009

G – Sarah Goss. The Black Ferns Sevens captain hoping to win her second RWC Sevens title and continue the 23-match unbeaten run they're currently on in 2018

H – Hong Kong. The only nation to host RWC Sevens on two occasions, in 1997 and 2005.

I – Innovation: The introduction of a new knock-out format means teams will have to win every match in order to be crowned Rugby World Cup Sevens winners.

J – Jamaica leave it late. Jamaica confirmed their place at a first RWC Sevens with a last-gasp try by captain Conan Osborne seeing off Guyana in the Rugby Americas North regional qualifier final.

K – Chen Keyi. A player to watch in the China women's squad when they take on USA in the round of 16 on Friday.

L – Ghislaine Landry. The Canada captain is the leading point scorer of all-time on the HSBC World Rugby Women’s Sevens Series with 984.

M – Melrose. The Scottish town where rugby sevens began 135 years ago and gave its name to the men's trophy, the Melrose Cup.

N – New Zealand. The defending champions in both the men's and women's events after their success at Moscow 2013.

O – Olympians. There are 99 veterans of Rio 2016 with slightly more women than men. There are 52 women, including eight of Australia's gold medallists, five New Zealand silver medallists and six of Canada's bronze medallists. There are 47 men with five Fijian gold medallists, five of Great Britain's silver medallists and five of South Africa's bronze medallists.

P – Points. A total of 17,994 points have been scored in RWC Sevens history, 15,618 in the six previous men's editions and 2,376 in the two women's tournaments to date.

Q – Lightning quick. Have you seen Carlin Isles and Portia Woodman turn on the afterburners? 

R – Russia. The hosts of the last RWC Sevens in June 2013, the second tournament to feature a men's and women's competition.

S – Select club. Only seven players have won Rugby World Cups in both 15s and sevens, four men and three women. England's Lawrence Dallaglio and Matt Dawson (RWC Sevens 1993 and RWC 2003), New Zealand's Mils Muliaina (RWC Sevens 2001 and RWC 2011) and Waisake Naholo (RWC Sevens 2013 and RWC 2015) in the men's event and New Zealand trio Portia Woodman, Sarah Goss (RWC Sevens 2013 and WRWC 2017) and Kelly Brazier (RWC Sevens 2013 and WRWC 2010 and 2017).

T – Gordon Tietjens. The legendary coach and World Rugby Hall of Fame inductee guided New Zealand to two RWC Sevens titles and a silver medal, but in 2018 will be targeting a first success for new charges Samoa.

U – Uganda. The Rugby Africa Sevens champions are one of five teams making their RWC Sevens debuts in San Francisco. Uganda, Jamaica and Papua New Guinea in the men's competition and Papua New Guinea and Mexico in the women's

V – Marika Vunibaka. Another Fijian sevens legend who is the top try scorer in RWC Sevens history with 23. Portia Woodman of New Zealand holds the honour in the women's event after scoring 12 in 2013.

W – Waisale Serevi. The Fijian maestro is the only man to play in four Rugby World Cup Sevens (1993-2005) and has lifted the Melrose Cup twice, both times in Hong Kong in 1997 and 2005. Serevi is the leading point scorer in RWC Sevens history with 297.

X – X-factor. With names like Perry Baker, Charlotte Caslick, Portia Woodman and Rosko Specman, rugby sevens can certainly never be described as predictable!

Y – Young Pongi: One of the stars of Tonga’s passage to San Francisco 2018 via the Pacific Mini Games.

Z – Zimbabwe: The Cheetahs qualified for their fifth tournament after a top-two finish at the Rugby Africa Sevens in 2017.