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Many programming languages do not allow you to begin a variable name with a number as it would make it more difficult for a compiler or interpreter to parse a program's source code.
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mpt_inactive_raid_volumes(9) [centos man page]

MPT_INACTIVE_RAID_VO(9) 				       Message-based devices					   MPT_INACTIVE_RAID_VO(9)

NAME
mpt_inactive_raid_volumes - sets up link list of phy_disk_nums for devices belonging in an inactive volume SYNOPSIS
void mpt_inactive_raid_volumes(MPT_ADAPTER * ioc, u8 channel, u8 id); ARGUMENTS
ioc pointer to per adapter structure channel volume channel id volume target id COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 MPT_INACTIVE_RAID_VO(9)

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STRUCT 
IEEE80211_CHA(9) Device registration STRUCT IEEE80211_CHA(9) NAME
struct_ieee80211_channel - channel definition SYNOPSIS
struct ieee80211_channel { enum ieee80211_band band; u16 center_freq; u16 hw_value; u32 flags; int max_antenna_gain; int max_power; int max_reg_power; bool beacon_found; u32 orig_flags; int orig_mag; int orig_mpwr; enum nl80211_dfs_state dfs_state; unsigned long dfs_state_entered; }; MEMBERS
band band this channel belongs to. center_freq center frequency in MHz hw_value hardware-specific value for the channel flags channel flags from enum ieee80211_channel_flags. max_antenna_gain maximum antenna gain in dBi max_power maximum transmission power (in dBm) max_reg_power maximum regulatory transmission power (in dBm) beacon_found helper to regulatory code to indicate when a beacon has been found on this channel. Use regulatory_hint_found_beacon to enable this, this is useful only on 5 GHz band. orig_flags channel flags at registration time, used by regulatory code to support devices with additional restrictions orig_mag internal use orig_mpwr internal use dfs_state current state of this channel. Only relevant if radar is required on this channel. dfs_state_entered timestamp (jiffies) when the dfs state was entered. DESCRIPTION
This structure describes a single channel for use with cfg80211. AUTHOR
Johannes Berg <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT IEEE80211_CHA(9)

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